HANDBOOK OF nRITISFT HEPATIC/E. 24 1 



ends, where are the antheridia, perigonial leaves 

 but little altered, more swollen at the base, and 

 rather broader. Antheridia few, oval, on a pe- 

 duncle of the same length. — {Plate 6, fig. j8.) 



Gymnomitrium crassifolium, Carr. 



Pulvinate, stoloniferous, branches ascend- 

 ing, fertile, clavate, without stipules, leaves 

 imbricate, orbiculate, acutely emarginate, con- 

 cave, segments short, acute, of thick texture, 

 minutely papillose, margin entire. Outer in- 

 volucral leaves much larger, free, cleft half 

 way into two obtuse lobes, inner involucra 

 shorter, three-lobed, connate, ciliate, dentate. 



Gyjnnomitriiiui crassifolium, Carr. Trans. 

 Bot. Soc, Edin. XIII., 461, t. 18, f. 3 ; Carr. 

 and Pears. Exs. No. 76. 



In Alpine situations. 



Forming broad shallow compact tufts of a dark 

 olive brown colour, nearly black when dry. 

 Stems 3-5 mm. long, simple, rhizomatous, 

 stout, decumben-t at base, with tawny radicles 

 on the underside, fertile shoots erect, sub- 

 clavate. Leaves smaller at the base, of nearly 

 equal size upwards, closely imbricate, erect, secund, 

 embracing and hiding the stem, roundish, thick, 

 very conv^ex, emarginate, segments and sinus 

 angular, margin entire, surface minutely papillose, 

 colour dull olive brown, subopaque. Dioicous. 

 Male shoots erect, terete, apex obtuse. Perigonial 

 leaves somewhat broader, tumid at the base, 



R 



